FROM TH2F
constant
20.757147229634104+-0.4324364996823679
chi2/ndof = 61.79891599218457
plane
6.762119880047606+-1.564129225295714
invpt slope = -3.856676725870505+-0.12561009812600366
theta slope = 44.87346406705733+-1.4787164917655424
chi2/ndof = 43.89604777157732
from tgraph2D
constant
83.29478980658544+-4.476546266596829
chi2/ndof = 2464.8543805311124
plane
13.67153837888744+-19.53321841142715
invpt slope = -1.6220885537164398+-1.4092455400793125
theta slope = 72.24920525546868+-17.53078453469164
chi2/ndof = 2171.9410865530112